package main
import "fmt"

func main(){
   
	var room = "unknown"

	switch room{
	case "cave":
		fmt.Println("你在山洞里")
	case "lake":
		fmt.Println("你在湖边")
	case "river":
		fmt.Println("你在河边")
    default:
	fmt.Println("不知道在那个地方")
	}
}